tDCS, Moral Decision-Making, fMRI

In the present study, we applied DC Brain Stimulator Plus to stimulate right temporoparietal junction (rTPJ). The target electrode was placed over the location of rTPJ; on the other hand, the return electrode was placed over the left supraorbital area. That is, during anodal tDCS, the anode was placed over CP6, and the cathode was placed over left supraorbital area; conversely, during cathodal tDCS, the cathode was placed over CP6, and the anode was placed over left supraorbital area. For the active stimulation, which are anodal and cathodal tDCS, a constant current of 1 mA was delivered through 35 cm2 electrode for 20 minutes with fade-in and fade-out of 10 seconds, producing a current density of 0.029 mA/cm2. On the other hand, same fade-in, fade-out, and current density were applied for the sham stimulation, but the duration of current-delivering only last 35 seconds. Therefore, participants could feel the skin sensation but did not have the after-effects of tDCS.